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1、BRITISH STANDARD AEROSPACE SERIES BS 2G 196:1971 Specification for Static invertors UDC 629.7.064,5:621.314.58 Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:15:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2G 196:1971 This British Standard, having been approved by the Aerospace Indust
2、ry Standards Committee, was published under the authority of the Executive Board of the Institution on 19 February 1971 BSI 12-1999 The following BSI references relate to the work on this standard: Committee reference ACE/45 Draft for comment 70/198 ISBN 0 580 06218 X Amendments issued since publica
3、tion Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:15:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2G 196:1971 BSI 12-1999i Contents Page Forewordiii 1General1 1.1Scope1 1.2Definitions1 1.3General construction1 1.4Preferred ratings1 1.5Supply characteristics1 1.6
4、Output voltage and frequency1 1.7Efficiency1 1.8Regulation response and stability1 1.9Voltage balance2 1.10Waveform of output voltage2 1.11Modulation of output voltage2 1.12Control of voltage and frequency2 1.12.1Voltage2 1.12.2Frequency2 1.13Adjustment of voltage2 1.14Phase sequence2 1.15Protection
5、2 1.15.1Voltage and frequency2 1.15.2Overload conditions2 1.15.3Short-circuit capacity2 1.15.4Automatic shut down2 1.15.5Reversed input polarity2 1.15.6Input voltage2 1.16Vibration, acceleration and climatic proofness2 2Particular requirementss 2.1Arrangement and construction3 2.2Terminal identifica
6、tion3 2.3Components3 2.4Radio interference3 2.5Compass interference3 2.6Starting3 2.7Cooling3 2.8Declarations3 2.9Marking4 2.10Warning notices4 3Tests4 3.1General4 3.2Test conditions4 3.3Type tests4 3.3.1Starting4 3.3.1.1Normal4 3.3.1.2Reversed input polarity4 3.3.2Voltage and frequency regulation4
7、3.3.3Transient response5 3.3.4Wave form5 3.3.5Protection5 3.3.5.1Transient voltage and input voltage5 Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:15:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2G 196:1971 ii BSI 12-1999 Page 3.3.5.2Output overvoltage5 3.3.5.3Output frequency5 3.3.
8、6Voltage modulation5 3.3.7Efficiency5 3.3.8Input current5 3.3.8.1Maximum current demand5 3.3.8.2Ripple current5 3.3.9Overload voltage5 3.3.10Short-circuit capacity6 3.3.11Insulation resistance6 3.3.12Environmental tests6 3.3.13Cooling test6 3.3.14Temperature and pressure6 3.3.15Fungus growth6 3.3.16
9、Leakage (hermetically sealed equipment)6 3.3.17Waterproofness6 3.3.18Vibration6 3.3.19Acceleration6 3.3.20Explosion proofness6 3.3.21Radio interference6 3.3.22Compass safe distance6 3.3.23Salt corrosion6 3.3.24Dust and sand7 3.3.25Contamination7 3.4Production acceptance tests7 3.4.1Voltage (and freq
10、uency) regulation7 3.4.2Reversed input polarity7 3.4.3Transient response7 3.4.4Waveform7 3.4.5Transient voltage and input voltage protection7 3.4.6Output frequency protection7 3.4.7Maximum current demand7 3.4.8Insulation resistance7 3.4.9Phase sequence (three phase invertors only)7 3.4.10Voltage bal
11、ance (three phase invertors only)7 3.4.11Endurance7 3.5Production quality tests7 3.5.1Sampling7 3.5.2Production quality tests7 3.5.2.1Short-circuit capacity7 3.5.2.2Waveform analysis7 3.5.2.3Temperature and pressure8 3.5.2.4Vibration8 3.5.2.5Further tests8 Appendix A Salt corrosion test11 Appendix B
12、 Dust and sand test11 Figure 1 Measuring device for dust and sand test12 Table 1 Voltage balance loads8 Table 2 Load configurations9 Table 3 Non-sinusoidal loads10 Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:15:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2G 196:1971 BSI 12-1999iii
13、 Foreword This revision of BS G 196:1966, has been prepared in the light of current knowledge of the manufacture and use of static invertors for aircraft. Account has been taken of discussion on the preparation of an ISO Recommendation for such invertors. The standard is intended to be used in conju
14、nction with the relevant specifications for particular designs of invertor. This British Standard requires reference to the British Standards given below: Various parts and sections of BS 2G 100 or BS 3G 100, “General requirements for equipment in aircraft”, as follows: BS 3G 100-0, Introduction1).
15、BS 3G 100-1, Identification, declaration and construction1). BS 2G 100-2, Environmental and operating conditions Section 2. Radio interference. BS 2G 100-3, Characteristics of aircraft electrical systems. BS 3G 100-2.3.3.1, Vibration. BS 3G 100-2.3.3.2, Temperature and pressure requirements. SP 20,
16、Panel type air filter elements for use with internal combustion engines and compressors on aircraft. BS 89, Electrical indicating instruments. BS 205, Glossary of terms used in electrical engineering. BS 410, Test sieves. NOTEThe figures in metric (SI) units are to be regarded as the standard. The c
17、onversions to imperial units are approximate. Accurate conversions should be based on the tables in BS 350, “Conversion factors and tables”. Information concerning SI units is given in PD 5686, “The use of SI units”. A British Standard does not purport to include all the necessary provisions of a co
18、ntract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i to iv, pages 1 to 12 and a back cover
19、. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. 1) In course of preparation. Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:15:06 GMT+00:00 2006, Uncontrolled Copy, (c)
20、 BSI iv blank Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:15:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2G 196:1971 BSI 12-19991 1 General 1.1 Scope This British Standard states the general design and test requirements for 400 Hz static invertors for aircraft. 1.2 Definitions For
21、 the purposes of this British Standard the definitions in BS 2052) and the following apply. static invertor a unit in which semiconductor devices are used for deriving alternating current at a constant voltage and frequency from a direct current supply 1.3 General construction 1.3.1 The design and c
22、onstruction of the invertor shall comply with the relevant requirements of BS 3G 100-13), and of the relevant invertor specification 1.3.2 Unless otherwise required by the relevant invertor specification, the design and construction of the invertor shall be such that it is suitable for operation at
23、altitudes up to 18 300 m (60 000 ft). (See also 2.7.) 1.4 Preferred ratings The preferred ratings for the invertors at sea level and at a temperature of + 70 C are as follows. If required by the relevant invertor specification the ratings at temperatures of + 55 C and + 85 C shall be declared. 1.5 S
24、upply characteristics 1.5.1 Unless otherwise required by the relevant invertor specification, the invertor shall be capable of operating over the normal input terminal voltage range specified for Category B equipment in BS 2G 100-34). 1.5.2 The invertor shall be capable of withstanding and operating
25、 under the conditions of transient and overvoltage input indicated by the appropriate curves in BS 2G 100-34). 1.5.3 The invertor shall be capable of operating with a supply at its terminations having a maximum impedance made up of 50 mA resistive, and 10 4H inductive components. The ripple voltage
26、superimposed on a smooth d.c. of this source impedance supply by normal operation of the invertor shall not exceed two volts peak to peak. The manufacturer shall declare if the invertor can operate only on a supply capable of accepting reverse current. 1.6 Output voltage and frequency 1.6.1 Single p
27、hase invertors shall have a nominal output voltage of 115 V r.m.s. 1.6.2 Three phase invertors shall have nominal output voltages of 200 V r.m.s. line to line. 1.6.3 Unless otherwise specified the specification requirements for three phase systems are related to line neutral voltages. 1.6.4 The nomi
28、nal output frequency shall be 400 Hz for all invertors. 1.7 Efficiency The manufacturer shall declare the maximum value of mean and r.m.s. input current of the invertor at full load, and with the most unfavourable input voltage. 1.7.1 The efficiency of the invertor on full load, unity power factor (
29、under the combination of ambient temperature and input voltage specified in the relevant invertor specification) shall be not less than 65 %. 1.8 Regulation response and stability When the load is switched from 10 % to 85 % and from 85 % to 10 % full load there shall be after the first main deviatio
30、n of voltage not more than one overshoot before the voltage remains within the modulation tolerance of the final steady state value, except that where the invertor response can be shown to be less than 20 ms, two overshoots may be permissible. 2) BS 205, “Glossary of terms used in electrical enginee
31、ring”. 3) In course of preparation. Rating in V A Single phase 100 150 250 500 750 1 000 Three phase 100 250 500 750 1 000 1 500 3 000 4) BS 2G 100, “General requirements for equipment in aircraft”, Part 3, “Characteristics of aircraft electrical systems”. Licensed Copy: sheffieldun sheffieldun, na,
32、 Tue Nov 28 14:15:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2G 196:1971 2 BSI 12-1999 1.8.1 During normal operation (including load switching from 10 % to 85 % and from 85 % to 10 % of system capacity of the invertor full load rating), voltage surges, when converted to their equivalent step f
33、unctions, shall lie between limits 5 and 6 on Figure 4d in BS 2G 100-35). 1.9 Voltage balance For a three phase invertor, loaded as indicated in Table 1, Item 2a, the maximum difference between individual line to line voltages and between line to neutral voltages shall not exceed 2 % of their nomina
34、l values. 1.10 Waveform of output voltage With the invertor energized as specified in 1.5 and supplying the loads indicated in Table 3, each steady state output voltage waveform at constant frequency shall be in accordance with the requirements of BS 2G 100-35), unless otherwise required by the rele
35、vant invertor specification. 1.11 Modulation of output voltage With the invertor energized as specified in 1.5, the modulation of the output voltage shall be in accordance with the requirements of BS 2G 100-34). NOTESince pulse loads are likely to result in excessive modulation the relevant invertor
36、 specification should state the nature of pulse loads which can be accepted. 1.12 Control of voltage and frequency 1.12.1 Voltage. Under any combination of input voltage specified in 1.5 and loads specified in Table 1, Item 1 or Item 2a, the individual line to neutral voltages shall be within the no
37、rmal limits specified by BS 2G 100-35), for the point of regulation in a constant frequency a.c. system. For three phase invertors the manufacturer shall declare the departure from this tolerance if it exceeds 3 %, when the load is unbalanced to the extent indicated in Table 1, Item 2b. The displace
38、ment between the line to neutral voltages shall be 120 4. 1.12.2 Frequency. Within the defined range of input voltages the frequency shall be within the limits specified in BS 2G 100-35), for constant frequency a.c. systems. 1.13 Adjustment of voltage Internal means shall be provided for adjusting t
39、he output voltage over a range of 2 %. 1.14 Phase sequence The invertor shall be designed so that normal phase sequence is ABC and operation in reverse is not possible. 1.15 Protection 1.15.1 Voltage and frequency. If required by the relevant invertor specification, means shall be provided for autom
40、atic shut down of the invertor if the steady-state output voltage or the frequency exceeds the relevant limits specified in BS 2G 100-35). 1.15.2 Overload conditions. Unless otherwise required by the relevant invertor specification, the invertor shall be able, without damage, to deliver 150 % rated
41、current for 100 s. The power factor and minimum input and output voltage shall be specified in the individual specification. 1.15.3 Short-circuit capacity. Unless otherwise required by the relevant invertor specification, the invertor shall be able, without damage, to deliver not less than 300 % rat
42、ed current in each case for a line to neutral and/or each line to line short-circuit for 5 s throughout the specified input voltage range. 1.15.4 Automatic shut down. Unless otherwise required by the relevant invertor specification, means shall be provided for automatic shut down on overload conditi
43、ons exceeding the limits stated in 1.15.2 and 1.15.3. 1.15.5 Reversed input polarity. Suitable means shall be provided for protecting the invertor from the effect of an inadvertent reversal of polarity. 1.15.6 Input voltage. The invertor shall not suffer damage as a result of connection to an input
44、supply having a voltage below the specified minimum. 1.16 Vibration, acceleration and climatic proofness The manufacturer shall declare the classification and grading of the invertor in respect of: 1) vibration, in accordance with BS 3G 100-2.3.16); 2) acceleration, in accordance with BS 2G 100-27);
45、 3) climatic conditions in accordance with the relevant subsections of BS 3G 100-2.38). 5) BS 2G 100, “General requirements for equipment in aircraft”, Part 3, Characteristics of aircraft electrical systems”. 6) BS 3G 100, “General requirements for equipment in aircraft”, Part 2, Section 3, Subsecti
46、on 3.1, “Vibration”. 7) BS 2G 100-2, “Environmental and operating conditions”. 8) BS 3G 100-2.3, “Environmental conditions”. Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:15:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2G 196:1971 BSI 12-19993 2 Particular requirements 2.1 Arrangemen
47、t and construction 2.1.1 There should preferably be no limitation in the performance of the invertor in respect of the attitude in which it may be mounted. Where any such limitation exists, this shall be declared. 2.1.2 If the invertor requires periodic overhaul it shall be designed so that the over
48、haul period is not less than 3 000 h. 2.1.3 The invertor shall conform in outline and size to the requirements of the individual specification. 2.2 Terminal identification Except when termination is by plug and socket connector the following method of terminal identification shall be adopted. The ph
49、ases shall be identified by the letters A, B and C (and, when colours are used in addition to the letters, by the colours red, yellow and blue respectively) in such a way that the voltages in the phases so marked attain their maximum values in the order A, B and C. Neutral points shall be brought out and identified by the letter N and, if colours are used, by the colour green. The markings L1 and L2 shall be used for single phase identification, and plus and minus signs for d.c. terminal identification. If a switching facility is installed in the invertor the co